http://www.flickr.com/photos/ossy59/sets/72157603469902678/
Many K-mount lenses are listed, from the K/M mount, to the A/F/FA and then to the DA ones. Some 3rd party lenses in K-mount are also listed. The official suggested price per lens is also plotted. But do note that all prices are German ones, nevertheless.
An example screen-shot of the charts is shown below. This one is for the FA*85/1.4:-
My hats off to the guy who compiled the plots! I can see the huge efforts involved (and that he paid)! :-o